body{
    margin: 0;
    padding: 0;
    background-color: #fff;
    font-family:"黑体";
    color: #ecefed;
}
ul{
    display: flex;
    list-style-type: none;
    justify-content: space-around;
}

.banner{
    width: 100%;
    min-width: 1200px;
    height: 80px;
    background-color: #39393b;
    display: flex;
    flex-direction: row;
    justify-content: space-around;
    align-items: center;
    font-size: 20px; 
    overflow: hidden;
    position: fixed;
    z-index: 999;
}
.banner-other li{
    padding: 10px 25px;
}
.banner-other li:hover{
    cursor:pointer;
    padding-bottom: 2px;
    border-bottom: #fff 2px solid;
}

.beginning{
    position: relative;
    width: 100%;
    height:700px;
    display: flex;
    flex-direction: row;
    justify-content:space-around;
    align-items: center;
    
}
    
  .face{
      width: 30%;
      height:200px;
      background-color: #e8b85e;
  }  

.beginning-font{
    color: #39393b;
    font-size: 20vh;
    font-family:'Franklin Gothic Medium', 'Arial Narrow', Arial, sans-serif;
}

.main{
    margin: 5%;
    display: grid;
    grid-template-columns: repeat(4,1fr);
    grid-template-rows: repeat(3,400px);
    justify-content: center;
    column-gap: 2px;
    row-gap: 2px; 
}

.main div{
    text-align: center;

    font-size:15pt ;
    line-height: 40px;
    letter-spacing: 2px;

}
.main p{
    font-size: 25pt;
}

.information{
   background-color: #39393b;
}
.edu{
    background-color: #688792;
    grid-column-start: 2;
    grid-column-end: 4;
}
.project{
    background-color: #82689e;
    grid-column-start: 4;

    grid-row-start: 1;
    grid-row-end: 3;
}
.task{
    grid-column-start: 1;
    grid-column-end: 3;
    background-color: #e8b85e;
    color: #39393b;
    display: flex;
    justify-content: center;
    flex-direction: column;
    align-items: center;
}
table {
    border-collapse: collapse;
 
 }
table td{
    border: 1px solid black;
}

th{
   border: 1px solid black;
}
.jieshao{
    background-color: #648d76;
}

.instant{
    background-color: #39393b;
    grid-column-start: 1;
    grid-column-end: 5;
}
a{
    color: #ecefed;
    text-decoration: none;
}

.homework{
    margin:20px auto;
    width: 50%;
    margin-bottom: 50px;

}
.homework-tittle{
    color: #39393b;
    font-size: 3em;
    text-align: center;
    border-bottom: 1px #39393b solid;
}
.homework-display{
    display: flex;
    background-color: #39393b;
    margin-top: 20px;
    flex-direction: column;


}
.display-main-tittle{
    font-size: 2em;
}
.homework-display-main{
    display: flex;
    flex-direction: column;
    background-color: #39393b;
}
.homework-display-main li{
    height: 50px;
}

.homework-display-main li a:hover{
    padding-bottom: 5px;
    border-bottom: 2px white solid;
}
